These are Heavy Duty Silver plated Jump Rings. They measure 

approx 6mm in diameter and are made with a 1mm diameter wire rather than the standard 0.7mm wire that is used on most of our jump rings.
Each pack contains 60 Jump Rings.
Jump Rings are one of the essential findings required in Jewellery making.
Combine postage and packing prices when you buy more than 1 packet of findings. See terms and conditions for postage and packing charges.